JP2003260474A - Water treatment system using fluorescence analyzer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water treatment system using a fluorescence analyzer capable of accurately performing the water treatment by suppressing the effect of a fluorescent brightener even if a fluorescent brightener is contained in water to be treated. <P>SOLUTION: The water treatment system is equipped with an ozone reaction tank 2, a fluorescence analyzer pretreatment part 5 to which water to be treated in the ozone reaction tank 2 is guided from a water sampling port 4 and the fluorescence analyzer 6. An oxidizing agent is injected in the water to be treated in the ozone reaction tank 2 in the fluorescence analyzer pretreatment part 5 and the fluorescence intensity in the water to be treated is calculated by the fluorescence analyzer 6. The effect of the fluorescent brightener is suppressed from the water to be treated by injecting the oxidizing agent in the water to be treated and ozone treatment can be accurately performed on the basis of the fluorescence intensity calculated by the fluorescence analyzer 6. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in water treatment facilities such as water purification treatment, sewage treatment, industrial wastewater treatment, food wastewater treatment, etc., and carries out water treatment using fluorescence intensity measured by a fluorescence analyzer as an index. The present invention relates to a water treatment system using an analyzer.

[0002]

2. Description of the Related Art In a water treatment facility such as a water purification plant, groundwater or surface water is used as raw water and introduced into a landing well, a flocculant is added to form flocs, and precipitation treatment is performed. After that, the supernatant liquid is filtered through sand to remove suspended matter, and finally subjected to final chlorine treatment for disinfection and supplied to customers. In order to further ensure the effect of disinfecting chlorine treatment, pre-chlorination before injecting chlorine and intermediate chlorine treatment by injecting chlorine into precipitation water are performed before the coagulant injection point.

Pre-chlorination is effective for removing ammoniacal nitrogen and microorganisms in raw water and for oxidizing and removing iron and manganese. However, for raw water with a large trihalomethane production ability, the amount of trihalomethane produced will increase due to pre-chlorine injection. Therefore, some water treatment plants have adopted intermediate chlorination to reduce trihalomethanes.

When the pre-chlorine is switched to the intermediate chlorine treatment or when the quality of the raw water is deteriorated and the normal treatment cannot be completed, powdered activated carbon is added to the raw water to adsorb and remove soluble substances. Currently, the input amount of activated carbon is not automatically controlled, but the operator determines the input amount based on a manual analysis value regarding the water quality of raw water.

Further, in a water purification plant for performing ozone treatment, which is an advanced water purification treatment, constant injection rate control for constant ozone injection rate or constant dissolved ozone concentration control for constant dissolved ozone concentration is performed. These are not a method of feedback control while checking the quality of treated water, but a method of grasping an ozone injection rate or a dissolved ozone concentration having a treatment effect in advance and performing ozone injection based on the information. Therefore, ozone is injected a little excessively.

By the way, since trihalomethane is a carcinogen, it is necessary to suppress the production of trihalomethane in the water treatment process. However, it takes time and cost to measure trihalomethane and the ability to generate trihalomethane, so it is impossible to control water quality while monitoring online.

Therefore, as a method for controlling the injection of ozone, activated carbon, or other chemicals while continuously monitoring the water quality, and controlling the injection of the minimum necessary amount without excess or deficiency, fluorescence that correlates with the concentration of the dissolved organic matter. A water quality control method using strength as an index has been proposed (JP-A-10-04).
3776 "Control system for ozone injectors"). According to this water quality control method, light having a wavelength of about 345 nm is used as excitation light, and the fluorescence intensity at a wavelength of about 425 nm, which has a high correlation with fulvic acid that is a representative substance of trihalomethane precursors, is obtained.
Water quality is controlled to reduce trihalomethane production.

[0008]

On the other hand, another fluorescent substance existing in natural water is a fluorescent whitening agent contained in a laundry detergent. For example, when the fluorescent whitening agent contained in domestic wastewater flows into the sewage treatment plant, the ratio of the fluorescent whitening agent in the treated water in the sewage treatment plant increases. When treating water containing an optical brightener in this way, the fluorescence intensity measured by the fluorescence analyzer is added to the fulvic acid concentration to be measured in addition to the fluorescence intensity component of the optical brightener,
It may be difficult to use the fluorescence intensity itself as an index for water quality control.

The present invention has been made in consideration of the above points, and when the water to be treated contains a fluorescent whitening agent, it is possible to eliminate the influence of the fluorescent whitening agent on the fluorescence developing property. An object of the present invention is to provide a water treatment system using a fluorescence analyzer that enables the above.

[0010]

The present invention relates to a water treatment system using a fluorescence analyzer, in which a water collecting portion for collecting water to be treated containing a fluorescent whitening agent and a water collecting portion connected to the water collecting portion are provided. A fluorescence analyzer that detects the fluorescence intensity of the treated water and a water treatment mechanism that performs water treatment on the water to be treated based on the signal from the fluorescence analyzer are provided. A fluorescence analyzer characterized by installing an oxidizer addition device for adding an oxidizer into water or a light irradiation device for irradiating light into the water to be treated to suppress the fluorescence expression due to the fluorescent whitening agent in the water to be treated. Is a water treatment system using.

In the present invention, the fluorescence analyzer has an excitation light wavelength of 4
It is a water treatment system using a fluorescence analyzer characterized by detecting the fluorescence intensity of a specific wavelength existing between 400 and 450 nm when the fluorescence wavelength is 00 to 450 nm.

The present invention is a water treatment system using a fluorescence analyzer characterized in that the wavelength width between the excitation light side and the detection side is 20 nm or less.

According to the present invention, the contact time for the water to be treated to which the oxidant has been added by the oxidant addition device to reach the fluorescence analyzer is between 10 seconds and 10 minutes. Is a water treatment system using.

The present invention is a water treatment system using a fluorescence analyzer, wherein the light irradiation device irradiates the water to be treated with ultraviolet rays for a light irradiation time of 10 seconds to 10 minutes.

The present invention is a water treatment system using a fluorescence analyzer, wherein the oxidizing agent adding device uses a chlorine agent as an oxidizing agent.

The present invention is a water treatment system using a fluorescence analyzer, wherein the oxidizing agent adding device uses ozone gas as an oxidizing agent.

The present invention is a water treatment system using a fluorescence analyzer, characterized in that the oxidant addition device adds the oxidant in an amount such that the residual concentration of the oxidant is not detected.

According to the present invention, the oxidizer addition device uses an oxidizer addition ratio of the oxidizer addition amount [mg] to the water amount [L] [mg].
/ L], a water treatment system using a fluorescence analyzer characterized by adding an oxidizing agent at an addition rate of 0.1 to 10 mg / L.

The present invention is a water treatment system using a fluorescence analyzer, wherein the water treatment mechanism is an ozone injection device.

The present invention is a water treatment system using a fluorescence analyzer, wherein the water treatment mechanism is a powder activated carbon injection device.

The present invention is a water treatment system using a fluorescence spectrometer, wherein the water treatment mechanism is a coagulant injection device.

The present invention is a water treatment system using a fluorescence analyzer, wherein the water treatment mechanism is a chlorine agent injection device.

The present invention is a water treatment system using a fluorescence analyzer, wherein the water treatment mechanism is a membrane filtration device.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

As an example of a water treatment system using the fluorescence analyzer according to the present invention, an advanced water purification treatment equipment having ozone injection equipment will be described. This advanced water treatment facility
It has a system that controls the minimum ozone injection amount required for reducing trihalomethane production capacity or reducing soluble organic substances using fluorescence intensity as an index, eliminating the influence of fluorescence expression by the fluorescent whitening agent and controlling ozone injection. The controllability of is improved.

Ozone treatment is effective in deodorizing, decolorizing, disinfecting water to be treated, oxidizing iron and manganese ions, decomposing organic substances, and reducing trihalomethane production ability, and is one of the typical treatment methods of advanced water purification treatment. is there.

On the other hand, the water to be treated contains a fluorescent whitening agent. Such optical brightener is a kind of dye,
It absorbs ultraviolet rays (wavelength near 380 nm) and emits visible light (wavelength near 440 nm) as fluorescence. When added to something originally yellowish like cotton, it adds a fluorescence to the original reflected light of the cloth, and looks shiny and white. Optical whitening agents are used in many commercial white clothing items at the manufacturing stage, but the optical whitening agents used in cotton, hemp, rayon, etc. fall off during washing, so To compensate for this, many detergents contain an optical brightener. For this reason, in a water treatment plant that uses a water source to which domestic wastewater may flow, raw water often contains an optical brightener.

FIG. 2 is a diagram showing an example of the molecular formula of the fluorescent whitening agent. Further, FIG. 3 is a diagram showing the influence of the fluorescent whitening agent on the fluorescent intensity of river water. As shown in FIGS. 2 and 3, even when a trace amount of the optical brightening agent of about 1 mg / L is mixed, the increase amount of the fluorescent intensity by the fluorescent whitening agent is large.

Next, referring to FIG. 1, a water treatment system using the fluorescence analyzer according to the present invention will be described.

As shown in FIG. 1, the water treatment system comprises a coagulating sedimentation tank 1 for coagulating sedimentation of water to be treated, an ozone reaction tank 2 connected to the coagulation sedimentation tank 1, and an ozone reaction tank 2. A water sampling port (water sampling part) 4 for sampling the untreated water, and a fluorescence analyzer pretreatment part (oxidizing agent adding device) 5 connected to the water sampling port 4 for adding an oxidant to the untreated water, And a fluorescence analyzer 6 connected to the fluorescence analyzer pretreatment unit 5 for detecting the fluorescence intensity of the water to be treated.

An air diffuser 9 is installed in the ozone reaction tank 2, and the ozone generator 8 supplies the ozonized air 8 to the air diffuser 9. Further, the ozone generator 7 is controlled by an ozone injection rate calculation device 10 which obtains a target ozone injection rate 11 based on a signal from the fluorescence analyzer 6.

Of the above components, the ozone reaction tank 2, the air diffuser 9, the ozone generator 7, and the ozone injection rate calculation device 1
0 constitutes a water treatment mechanism for injecting ozone into the water to be treated.

Next, the operation of this embodiment having such a configuration will be described.

First, the water to be treated which has been subjected to the coagulation treatment in the coagulation sedimentation tank 1 flows into the ozone reaction tank 2 and is ozone-treated in the ozone reaction tank 2 by the ozone supplied from the diffuser pipe 9. The water to be treated that has been subjected to ozone treatment in the ozone reaction tank 2 is drained from the ozone reaction tank 2 and sent to the next step.

It should be noted that chlorine has not yet been injected into the water to be treated flowing into the ozone reaction tank 2.

During this time, a part of the water to be treated in the ozone reaction tank 2 is guided to the fluorescence analyzer pretreatment section 5 via the water sampling port 4. In the fluorescence analyzer pretreatment unit 5, in order to eliminate the fluorescence developability of the fluorescent night stimulant, the addition rate of sodium hypochlorite as an oxidant into the water to be treated is 0.1 to 10 mg / L, preferably 1.0 mg. / L is injected. Addition rate here mg / L
Means the ratio of the added amount of the oxidizing agent to mg of the water amount L.

FIG. 4 is a graph showing an example of the relationship between the fluorescence intensity of the fluorescent whitening agent and the sodium hypochlorite addition rate. As shown in FIG. 4, the addition rate of sodium hypochlorite is 1.0 mg.
/ L, the fluorescence intensity of the optical brightener is decreased by 99% or more.

The water to be treated to which the oxidizing agent is added in the pretreatment section 5 of the fluorescence analyzer reaches the fluorescence analyzer 6 after a contact time of 10 seconds to 10 minutes, preferably 1 minute.
In, the fluorescence intensity of the water to be treated is continuously measured.

As described above, the ozone generated by the ozone generator 7 is supplied to the ozone reaction tank 2 as the ozonized air 8 through the air diffuser 9. In the ozone generator 7, the target ozone injection rate 11 calculated by the ozone injection rate calculation device 10 is calculated.
Ozone is generated by the amount of generated ozone such that .

In the fluorescence analyzer 6 of this embodiment,
When the excitation wavelength is 400 to 450 nm, the fluorescence intensity of a specific wavelength between the fluorescence wavelengths of 400 to 450 nm is calculated.
Preferably, the fluorescence intensity at a fluorescence wavelength of 425 nm is calculated. The fluorescence intensity obtained by the fluorescence analyzer 6 is measured by the fluorescence analyzer pretreatment unit 5
By the treatment with 1, it is possible to eliminate the fluorescence expressing property of the optical brightener, so that the correlation with the trihalomethane-forming ability is strengthened. FIG. 5 is a diagram showing an example of the relationship between the fluorescence intensity after the pretreatment process performed in the fluorescence analyzer pretreatment unit 5 and the trihalomethane production ability.

In the ozone injection rate calculation device 10, FIG.
Using the relationship shown in, the fluorescence intensity corresponding to the target trihalomethane-forming ability is set as the target fluorescence intensity. Next, in the ozone injection rate calculation device 10, continuously measured ozone treated water 3
A feedback (FB) calculation is performed so that the fluorescence intensity of ∘ becomes closer to the target fluorescence intensity, and the target ozone injection rate 11 is output to the ozone generator 7. The ozone generator 7 generates ozonized air 8 according to the target ozone injection rate 11, and the generated ozonized air 8 is injected into the ozone reaction tank 2.

As described above, according to the present embodiment, the oxidant is added to the water to be treated in the fluorescence analyzer pretreatment section 5 to eliminate the fluorescence expression of the fluorescent whitening agent, and then the fluorescence analyzer is removed. The target ozone injection rate 11 is calculated by the ozone injection rate calculation device 10 on the basis of the fluorescence intensity measured by 6, and the ozone injection amount is FB controlled. For this reason, reduction of trihalomethane production ability and reduction of soluble organic substances can be accurately realized, and the operation efficiency of ozone treatment can be improved.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. As an example of the water treatment system according to the present invention, an advanced water purification treatment facility having an ozone injection facility and a pre-chlorination facility before ozone treatment will be described. This advanced water purification facility has a system that controls the minimum ozone injection amount required for reducing trihalomethane production capacity or reducing soluble organic substances using fluorescence intensity as an index, eliminating the influence of fluorescence expression by fluorescent whitening agents. However, the controllability of ozone injection control is improved.

FIG. 6 is a block diagram showing a second embodiment of the present invention. As shown in FIG. 6, a pre-chlorination facility 13 is provided on the upstream side of the coagulating sedimentation tank 1. In the pre-chlorination facility 13, pre-chlorination is performed on the water to be treated in order to remove iron, manganese, ammonia and nitrous acid, suppress algae overgrowth in the settling basin, and prevent settling sludge decay in the settling basin. Be seen.

In the pre-chlorination facility 13, sodium hypochlorite is added to the water to be treated at an addition rate of 1 mg / L. As shown in FIG. 4, the addition rate of this sodium hypochlorite is about the same as the injection rate for eliminating the influence of the fluorescence expression of the optical brightener. Therefore, the pre-chlorination facility 1
Since the pre-chlorination treatment in 3 can eliminate the influence of the fluorescence expression of the fluorescent whitening agent, the fluorescence analyzer pre-treatment unit 5 may be removed. In this case, the water to be treated in the ozone reaction tank 2 is directly guided from the water sampling port 4 to the fluorescence analyzer 6 via the bypass line 5a, and the fluorescence intensity of the water to be treated is continuously measured by the fluorescence analyzer 6. It

In FIG. 6, the same parts as those in the first embodiment shown in FIGS. 1 to 5 are designated by the same reference numerals and detailed description thereof will be omitted.

Next, the operation of the second embodiment shown in FIG. 6 will be described. In the ozone injection rate calculation device 10,
Using the relationship of FIG. 5, the fluorescence intensity corresponding to the target trihalomethane-forming ability is set as the target fluorescence intensity. That is, in the ozone injection rate calculation device 10, feedback (FB) calculation is performed so that the fluorescence intensity of the water to be treated continuously measured by the fluorescence analyzer 6 approaches the target fluorescence intensity, and the target ozone injection rate 11 is calculated to generate ozone. Output to the container 7. In the ozone generator 7, the ozonized air 8 is generated according to the target ozone injection rate 11, and the ozonized air 8 is injected into the ozone reaction tank 2.

According to this embodiment, the pre-chlorination facility 1
3 (or the pre-chlorination facility 13 and the fluorescence analyzer pretreatment unit 5), the treated water is treated to eliminate the fluorescence expression of the fluorescent whitening agent, and then the fluorescence in the treated water is measured by the fluorescence analyzer 6. The intensity is measured. Next, the target ozone injection rate 11 is calculated by the ozone injection rate calculation device 10 from the fluorescence intensity measured in this way, and the ozone injection amount is F
Since the B control is performed, it is possible to accurately reduce the trihalomethane generation ability and the soluble organic substances, and it is possible to improve the operation efficiency of the ozone treatment.

In each of the above-mentioned embodiments, sodium hypochlorite was used as the oxidizing agent added in the fluorescence analyzer pretreatment unit 5 and the prechlorination facility 13, but in addition, ozone, chlorine dioxide, chlorine An oxidizing agent such as gas may be added. The amount of these oxidizing agents added is preferably such that no residual concentration can be detected.
It can be used within a range up to about twice. The addition rate of oxidant is preferably 1 mg / L, but 0.1-10 mg / L
The addition rate may be within the range.

As the fluorescence analyzer pretreatment section 5, a light irradiation device may be provided instead of the oxidant addition device. In this case, in the fluorescence analyzer pretreatment unit 5, it is preferable to irradiate the water to be treated with ultraviolet rays for 10 seconds to 10 minutes.

In each of the above-described embodiments, an example in which an ozone injecting device including the ozone reaction tank 2, the air diffuser 9, the ozone generator 7 and the injection rate calculating device 10 is provided as the water treatment mechanism is shown. Not limited to water treatment mechanism, powder activated carbon injection device for injecting powder activated carbon, coagulant injection device for injecting coagulant, chlorine agent injection device for injecting chlorine agent,
Alternatively, a membrane filtration device may be used to control these water treatment mechanisms based on the fluorescence intensity from the fluorescence analyzer 6.

Further, the fluorescence intensity from the fluorescence analyzer 6 may be used to control the amount of oxidizing agent added or the amount of UV irradiation in the fluorescence analyzer pretreatment section 5.

[0053]

As described above, according to the present invention, even when the water to be treated contains an optical brightener, the water to be treated is added with an oxidizing agent or irradiated with light to enhance the fluorescence. It is possible to eliminate the influence of whitening agents. Therefore, it is possible to accurately reduce the trihalomethane generation ability and the soluble organic matter, and it is possible to improve the operation efficiency of the water treatment of the water to be treated.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a water treatment system using a fluorescence analyzer according to the present invention.

FIG. 2 is a view showing an example of a molecular formula of a fluorescent whitening agent.

FIG. 3 is a diagram showing the influence of a fluorescent whitening agent on the fluorescence intensity.

FIG. 4 is a graph showing the relationship between the fluorescence intensity of a fluorescent whitening agent and the sodium hypochlorite addition rate.

FIG. 5 is a diagram showing the relationship between the fluorescence intensity after the pretreatment step and the trihalomethane production ability.

FIG. 6 is a configuration diagram showing a second embodiment of a water treatment system using a fluorescence analyzer according to the present invention.

[Explanation of symbols]

1 coagulation sedimentation tank 2 Ozone reaction tank 4 Water sampling port 5 Fluorescence analyzer pretreatment section 6 Fluorescence analyzer 7 Ozone generator 8 ozonized air 9 Air diffuser 10 Ozone injection rate calculator 11 Target ozone injection rate 13 Pre-chlorination equipment

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C02F 1/44 C02F 1/44 K 1/78 1/78 G01N 21/64 G01N 21/64 Z (72) Inventor Kotaro Ian 1 Toshiba Town, Fuchu City, Tokyo (72) Inventor of Toshiba Fuchu Works (72) Inventor Masao Kaneko 1 Toshiba Town, Fuchu, Tokyo Tokyo Fuchu Office, Ltd. (72) Inventor Abe Fukitsu, Tokyo, Fuchu-shi, Toshiba No. 1 at Toshiba Fuchu Works, Ltd. (72) Inventor Setsuo Suzuki No. 1, Toshiba-cho, Fuchu-shi, Tokyo Tokyo Fuchu Works, Ltd. (72) Inventor Kenji Taguchi Tokyo 1-1-1, Shibaura, Minato-ku, Toshiba Headquarters Office (72) Inventor Takumi Hayashi 1st, Toshiba-cho, Fuchu, Tokyo Tokyo Fuchu Works (72) Inventor Hiroshi Kikuike Kyoto Fuchu-shi, Toshiba No. 1 at Fuchu Works, Toshiba Corp. (72) Inventor Toshiyuki Kudo No. 1, Toshiba-cho, Fuchu-shi, Tokyo Tokyo Fuchu Works, Ltd. (72) Inventor Akira Hiramoto Tokyo-Fuchu-shi, Tokyo No. 1 Toshiba Fuchu Works (72) Inventor Nobuyoshi Kaiga 66-2 Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa F-term (reference) 2F043 AA01 BA14 CA03 DA02 DA05 EA01 GA25 GB21 KA02 of Toshiba Engineering Co., Ltd. KA03 KA05 MA01 4D006 GA02 KA01 KB04 KB30 KE11P PB08 4D024 AA04 AB02 AB11 BA02 BB01 BC04 DA04 DB10 DB23 4D037 AA11 AB05 AB12 AB13 BA18 CA01 CA03 CA08 4D050 AA12 AA15 AB03 AB17 AB18 BB02 CA06 CA06 CA06 CA06 CA06

Claims (14)

[Claims] 1. In a water treatment system using a fluorescence analyzer, a water sampling section for sampling water to be treated containing a fluorescent whitening agent, and a water sampling section connected to the water sampling section to detect the fluorescence intensity of the water to be treated. Equipped with a fluorescence analyzer and a water treatment mechanism that performs water treatment on the water to be treated based on the signal from the fluorescence analyzer.Oxidation that adds an oxidant to the water to be treated upstream of the fluorescence analyzer. A water treatment system using a fluorescence analyzer, characterized in that an agent addition device or a light irradiation device for irradiating light into the water to be treated is installed to suppress the fluorescence expression due to the fluorescent whitening agent in the water to be treated. 2. A fluorescence analyzer having an excitation light wavelength of 400 to 45.
The water treatment system using the fluorescence analyzer according to claim 1, wherein when the wavelength is 0 nm, the fluorescence intensity of a specific wavelength existing between 400 and 450 nm is detected. 3. The water treatment system using the fluorescence analyzer according to claim 1, wherein the fluorescence analyzer has a wavelength width on the excitation light side and the detection side of 20 nm or less. 4. The contact time for the water to be treated to which the oxidant has been added by the oxidant addition device to reach the fluorescence spectrometer is 1
The water treatment system using the fluorescence analyzer according to claim 1, wherein the water treatment system is for 0 second to 10 minutes. 5. The water treatment system using a fluorescence analyzer according to claim 1, wherein the light irradiation device irradiates the water to be treated with ultraviolet rays for a light irradiation time of 10 seconds to 10 minutes. 6. A water treatment system using a fluorescence analyzer according to claim 1, wherein the oxidizing agent adding device uses a chlorine agent as an oxidizing agent. 7. The water treatment system using a fluorescence analyzer according to claim 1, wherein the oxidizing agent adding device uses ozone gas as an oxidizing agent. 8. The water treatment system using a fluorescence analyzer according to claim 1, wherein the oxidant addition device adds the oxidant in an amount such that the residual concentration of the oxidant is not detected. 9. An oxidant addition device, wherein the oxidant addition rate is expressed as the ratio [mg / L] of the oxidant addition amount [mg] to the water amount [L], the addition rate is 0.1 to 10 mg / L. The water treatment system using the fluorescence analyzer according to claim 1, wherein an oxidizing agent is added. 10. A water treatment system using a fluorescence analyzer according to claim 1, wherein the water treatment mechanism is an ozone injection device. 11. The water treatment system using a fluorescence analyzer according to claim 1, wherein the water treatment mechanism is a powdered activated carbon injection device. 12. The water treatment system using a fluorescence analyzer according to claim 1, wherein the water treatment mechanism is a coagulant injection device. 13. The water treatment system using a fluorescence analyzer according to claim 1, wherein the water treatment mechanism is a chlorine agent injection device. 14. The water treatment system using a fluorescence analyzer according to claim 1, wherein the water treatment mechanism is a membrane filtration device.